Grinding wheel dresser



June 23, 1'31 J. H. NELSON.

GRINDING WHEEL DRESSER Filed March 28, 1940 3 Sheets-Sheet 2 i INVEATOR. I Fflfima Ala/Mu ATTORNEYSv June 23, 1942. J. H. NELSON GRINDING WHEEL nivassnn 5 Sheets-Sheet 3 Filed March 28, 1940 rlll ATTORNEYS.

Patente d June 23, 1942 UNITED stares GRINDING WHEEL DRESSER James Holly Nelson, Racine, Wis. assignor to The, Dumore Company, Racine, Wis., a corporation of Wisconsin Application March 28, 1940, Serial No. 326,507

7 Claims.

My invention relates to improvements in grinding wheel dressers.

One of the objects of the invention is to provide a device of this character which is in the form of an attachment to a lathe, and which may be positioned readily without interfering with the setting of the motor driven grinder.

Another object is to provide a grinding wheel dresser having a supporting part which may be clamped to the tailstock spindle of the lathe.

A further object is to provide a dresser which is adjustable back and forth on a guide arranged parallel to the bed of the lathe and located above and to the rear of said lathe bed.

An additional object is to provide a device of this character in which the guide is secured at one end only to part of the lathe and merely rests on another part thereof.

A further object is to provide an improved dressing device in which the diamond tips are moved back and forth by rocking a lever.

In the accompanying drawings I have illustrated one embodiment of the invention.

Fig. 1 is a plan view of a lathe with a grinder and a grinding wheel dresser mounted thereon;

Fig. 2 is a side elevation of the grinding wheel dresser;

Fig. 3 is a front elevation thereof;

Fig. 4 is an end elevation of a clamp;

Fig. 5 is a plan view on a larger scale of the grinding wheel dresser;

Fig. 6 is a plan view of. the adjustable support for the grinder;

Fig. 7 is a front view of the same with the grinding wheel and the quill in which the grinding wheel shaft is mounted, shown in dotted lines;

Fig. 8 is a side elevation of certain beveled arms which engage said quill;

Fig. 9 is an end elevation of an adjusting block; and

Fig. 10 is a side elevation thereof.

The grinder hereinafter described is mounted on the lathe compound It by means of a mounting post II which has the usual T-bolt, the head 52 of which fits in the slot in the compound so that the parts may be clamped in place by the nut I3 at the top. Said mounting post has a vertical slot hi therein which receives an adjusting block carrying a vertical stud l6 which may be adjusted up and down by means of a knurled nut It near the top of said mounting post.

The vertically adjustable block l5 supports a mounting plate I! having graduations I 8 on an are shaped surface at the top. Said mounting plate has rearwardly extending arms 19 near each end, the under surfaces 20 of which are inclined or beveled, as shown in Fig. 8.

Said mounting plate also supports a cylindric mounting post 2i on which the grinder is mounted. This mounting post extends horizontally to the rear of the structure, as viewed from the front of the lathe.

The grinder as a Whole is indicated at 22 and as shown herein represents equipment which is well known. It has a supporting frame 23 in which is mounted acylindrical structure or quill 24. The motor 25 is suitably hinged to the frame 23 and is provided with the usual pulley and belt connection to the grinder shaft 26 for rotating the latter at high speed. The grinding wheel 21 which is mounted on said shaft, represents any one of a number of different grinding wheels adapted for different work. The grinder "is clamped to the horizontal mounting post 2| by means of a locking screw 28 of conventional design, whereby the grinder is clamped at the proper helical angle for the thread to be ground. In fitting the apertured grinder frame 23 over the cylindrical post. 2i, said frame is slid onto said post until the cylindrical surfaceof the quill 24 rests against the beveled surfaces 20 of the lugs I9, after. which the screw 28 is tightened. The advantage of this arrangement is that it automatically times the quill 24 with3the' zero reading of the graduations l8 of the mounting plate ll of which the lugs I9 are a part. This enables the operator to raise or lower the grinder with knurled nut Iii-A to the proper height of the lathe spindle center and then tilt the grinder spindle to the proper helical angle of the thread to be ground, and lock with nut 29.

The thread of the shaft 30 which is being ground, is mounted in the lathe as usual, between the head 3| and the tailstock 32. When it is desired to true up the grinding edges of the grinding wheel by means of the dresser, the workpiece is removed from the lathe and the dressing device applied thereto. This device consists of a mounting clamp 33 and a cap 34 which are drawn together by cap screws 35 to clamp the device to the tailstock spindle, as shown in Fig. 4. Said mounting clamp has an aperture 36 which receives a supporting shaft 3'! at one end thereof, the opposite end being steadied and supported by a rod 38 having an offset in it, which rod is clamped in any desired position by a lock screw 39 whereby said rod may rest on any available part of the lathe and prevent what Would other- .i -M vi.

wise be too much overhanging of the dressing device mounted on said shaft.

The mounting block 40 of the dressing device is apertured to receive the supporting shaft 31 and may be clamped thereto by the set screw 4|, see Fig. 2. The mounting block supports indexing plates 42', 43, one of which is preferably integral therewith and the other of which may be swung back or forth to adjust it with respect to the first plate at 44, said first plate having graduations 45 on an upper, are shaped surface thereof. any desired position of relative adjustment by a cap screw 46 whereby the dressing attachment may be set for the same helical angle as that at which the grinder is set.

The vertical plate 42 has a forwardly extending horizontal plate 41 on which are positioned the two plates in which the diamond tips are mounted. These two plates, 48, 49, each have a downwardly extending lug 50 which slides in one of the two slots 5| arranged to form a V. Each plate carries one of the diamond tips 52, as shown in Fig. 5. Each of said plates is connected by a link 53 to a pivoted actuating lever 54 provided with a handle 55, whereby when said actuating lever is rocked back and forth. said plates slide back and forth, being guided by the V shaped arrangement of the grooves. In this operation the dressing device is so mounted with respect to the grinding wheel that the diamond points ride back and forth over the beveled edges thereof to restore the accuracy of the same.

I claim:

1. A grinding wheel dresser for mounting on a lathe having a frame, a headstock and a tall stock with a spindle, said dresser comprising a supporting member removably secured to said tailstock spindle, a longitudinal member secured to said supporting member substantially parallel to the axis of said tailstock spindle, and extending'toward said headstock, and a dressing device adjustably mounted on said longitudinal member whereby it may be positioned between said headstock and said tailstock.

2. A grinding wheel dresser for mounting on a lathe having a frame, a headstock and a tailstock with a spindle, said dresser consisting of a longitudinal member clamped at one end to said tailstock spindle and extending toward said headstock parallel to the axis of said tailstock Said indexing plates are clamped in' spindle, and a diamond tip support movably mounted on said longitudinal member whereby it may be positioned between said headstock and said tailstock.

3. A grinding wheel dresser as in claim 2, with the addition of a vertical supporting member adjustably secured to said longitudinal member whereby the lower end of said vertical supporting member may rest on said frame.

4. The combination with a grinding wheel dresser as in claim 2, with a motor driven grinder having a support mounted on the lathe compound whereby, after the grinding wheel has been clamped in place, the grinding wheel dresser may be positioned in proper operative relation thereto.

5. The combination with a grinding wheel dresser as in claim 2, with a motor driven grinder mounted on the lathe compound to tilt about a horizontal axis, and comprising a motor, a grinding wheel shaft with a grinding wheel thereon, a quill in which said shaft isrotatably mounted, and means engaging said quill to set the same and said grinding wheel at the desired helical angle.

6. The combination with a lathe having a headstock, a tailstock spindle and a slidable carriage, of a motor supporting base mounted on said carriage, a grinder connected to said motor and driven thereby, a grinding wheel dressing device mounted on said tailstock spindle on the side thereof opposite from that on which said motor is positioned and adjustable to a point between said headstock and said tailstock spindle, said dressing device comprising relatively movable parts which may be adjusted to the same helical angle as that to which said grinding wheel is adjusted, whereby the" dressing operation may be performed without interfering with the setting of said grinding wheel.

'7. Apparatus as in claim 6, in which said dressing device comprises a plate with slots therein arranged in V formation, supporting devices slidable in said slots, a diamond holder in each of said supports, a reciprocable lever and connections therefrom to said supports to. move the latter back and forth againt opposite faces of said grinding wheel, when said handle is rocked.

JAMES HOLLY NELSON. 

